Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
87°F
31°C
| Humidity | 34% |
| Wind Speed | S 18 G 22 mph |
| Barometer | 30.00 in (1015.3 mb) |
| Dewpoint | 55°F (13°C) |
| Visibility | 10.00 mi |
| Heat Index | 85°F (29°C) |
| Last update | 24 Mar 3:56 pm CDT |
Extended Forecast for
4 Miles SW San Marcos TX
Tonight

Low: 63 °F
Increasing
CloudsWednesday
High: 88 °F
Patchy Fog
then SunnyWednesday Night

Low: 63 °F
Increasing
CloudsThursday

High: 88 °F
Becoming
SunnyThursday Night

Low: 62 °F
Mostly Clear
Friday

High: 89 °F
Mostly Sunny
Friday Night

Low: 59 °F
Partly Cloudy
Saturday

High: 82 °F
Partly Sunny
Saturday Night

Low: 55 °F
Mostly Clear
Detailed Forecast
Tonight
Increasing clouds, with a low around 63. South wind 5 to 10 mph.
Wednesday
Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Increasing clouds, with a low around 63. South southeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
Mostly cloudy through mid morning, then gradual clearing, with a high near 88. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 62. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 89. South wind 5 to 10 mph becoming east southeast in the afternoon.
Friday Night
Partly cloudy, with a low around 59. East northeast wind 5 to 10 mph.
Saturday
Partly sunny, with a high near 82. North northeast wind around 10 mph.
Saturday Night
Mostly clear, with a low around 55. East northeast wind 5 to 10 mph becoming southeast after midnight.
Sunday
Sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Partly sunny, with a high near 87.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 89.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
4 Miles SW San Marcos TX
29.86°N 97.99°W (Elev. 748 ft)
29.86°N 97.99°W (Elev. 748 ft)
2:44 pm CDT Mar 24, 2026
4pm CDT Mar 24, 2026-6pm CDT Mar 31, 2026


